A bomb exploded Tuesday morning near the North Giza Court on Sudan Street in Imbaba district, the Interior Ministry said in a statement.
The blast went off at 7:30 am, causing damage to the façade of the courthouse, but resulted in no deaths or injuries. Security forces are currently investigating the scene, the ministry said.
The explosion occurred just an hour and a half before polls were set to open across the country as Egyptians prepare to vote in the constitutional referendum.
Security is on high alert for the two-day voting period, with the military and Interior Ministry securing polling stations. The security presence has been intensified around police stations, government offices and squares, including Tahrir, Nahda and Rabea al-Adaweya, to prevent the important areas from being occupied by protesters affiliated with the Muslim Brotherhood, a ministry official said.
The Health Ministry has prepared an emergency plan for the two-day referendum on the draft constitution, Minister of Health Maha al-Rabat announced Sunday, state-owned news portal Egynews reported.